linux-kernel - Re: [PATCH 3/5] mm, memory_hotplug: drop pointless block alignment checks from __offline

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Message-ID: <20181116111954.GG14706@dhcp22.suse.cz>
Date:   Fri, 16 Nov 2018 12:19:54 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     osalvador <osalvador@...e.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Baoquan He <bhe@...hat.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] mm, memory_hotplug: drop pointless block alignment
 checks from __offline_pages

On Fri 16-11-18 11:34:03, Oscar Salvador wrote:
> On Fri, 2018-11-16 at 09:30 +0100, Michal Hocko wrote:
> > From: Michal Hocko <mhocko@...e.com>
> > 
> > This function is never called from a context which would provide
> > misaligned pfn range so drop the pointless check.
> > 
> > Signed-off-by: Michal Hocko <mhocko@...e.com>
> 
> I vaguely remember that someone reported a problem about misaligned
> range on powerpc.
> Not sure at which stage was (online/offline).
> Although I am not sure if that was valid at all.

If we are talking about the same thing then this was about partial
memblock initialized (aka struct pages were not initialized).

> Reviewed-by: Oscar Salvador <osalvador@...e.de>

Thanks!

-- 
Michal Hocko
SUSE Labs